1987 年 51 巻 12 号 p. 3275-3280
Bacillus circulans F-2 requires a special carbon source or cultural conditions for amylase production. The α-glucosidase production of this bacterium was studied in various cultural conditions with measured glucose concentrations. High amylase production was always accompanied by low α-glucosidase production and the absence of glucose in culture broth. Usually higher α-glucosidase production was observed in cultural conditions where little amylase was produced. In the presence of 1-deoxynojirimycin, an inhibitor of α-glucosidase activity, the bacterium produced significant amounts of amylase even in conditions giving high α-glucosidase production. It was concluded that the special requirement of this bacterium to produce amylase is effected by its high sensitivity to glucose repression and by the production of α-glucosidase which leads to the formation of glucose. Production of α-glucosidase was, like that of amylase, induced by maltooligosaccharides and repressed by glucose, but both its induction and repression are less sensitive to glucose than those of amylase.
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